/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/DenseMatrix.h
Set the specified 3x3 block to a diagonal matrix with the specified diagonal and off-diagonal values.
void SetBlockAtDiagonal33 ( const int32 RowOffset, const int32 ColumnOffset, const [FReal](API\Runtime\ChaosCore\Chaos\FReal) VDiag, const [FReal](API\Runtime\ChaosCore\Chaos\FReal) VOffDiag )